Reversing device for engine-valves and other uses.



PATBNTED MAR. 24, 1908.

. K, c. HOXIE.

RBVERSING DEVICE FOR ENGINE VALVES AND OTHER USES.

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- PATBNTED MAR. 24', 1908.

K. c. HOXIE. REVERSING DEVICE FOR ENGINE VALVES AND OTHER USES.

APPLICATION FILED OCT. 9; 1907.

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KINNEY C. HOXIE, OF DULUTH, MINNESOTA.

REVERSING DEVICE FOR ENGINE-VALVES AND OTHER USES.

Specification of Letters Patent.

Patented March 24, 1908.

Application filed October 9, 1907. Seria1 No. 396,634.

To all whom it may concern:

Be it known that I, KINNEY C. HOXIE, a citizen of the United States, andresident'of Duluth, Minnesota, have invented certain new and usefulImprovements in Reversing Devices for Engine-Valves and other Uses, ofwhich the following is a specification ac companied by drawings.

This invention relates to reversing devices for engine valves and otheruses, and the objects of the invention are to improve upon such devicesand render them more efiicient and certain in operation, reduce thenumber of points at which wear may occur, and obviate the necessity ofimparting motion to a valve or other device from a point moving in grcsdof a circle, thus reducing the tendency to Further objects of theinvention will hereinafter appear and to these ends the inventionconsists of a device for carrying out the above objects embodying thefeatures of construction, combinations of elements and ar rangement ofparts having the general mode of operation substantially as hereinafterfully described and claimed in this specification, and shown in theaccompanying drawings, in which,-

Figure 1 is a longitudinal elevation of a device embodying the inventionpartly in section; Fig. 2 is a transverse sectional view on the line 22of Fig. 1, looking in the direction of the arrows; Fig. 3 is an end viewof the device partly in section. Fig. 4 is a vertical detail sectionalview taken through the controlling valve.

Referring to the drawings, D represents the bed or frame of theapparatus to which are bolted or otherwise secured the fluid pressurecylinders A, B and C, having the plungers E, F and G passing through thestuffing boxes H, I and J. I have chosen to illustrate my invention bymeans of three cylinders, two of which, A and B, are opposed to thethird cylinder C, but I am not to be understood as limiting theinvention to any particular number of cylinders. The cylinders arepreferably arranged in opposed differentially acting sets, and when Ispeak of a set, I mean one or more cylinders. In the drawings, thecylinders A and B constitute one set and the cylinder C constitutesanother set opposed thereto.

The plungers E and F of cylinders A and B are preferably ofsubstantially the same effective area, and the plunger G of cylinder Cis of greater effective area than either of the plungers E and F. Forconvenience of illustration, the area of plunger G may be assumed to be3/2 E or 3/2 F, and the combined area of plungers E and F is thereforegreater than that of G, although these figures need not be adhered to inactual practice.

Preferably the cylinders A and C are arran ed in alinement with eachother for practica purposes, although this is not necessary, and theplungers E and G are connected together, forming a common plunger, towhich is suitably screw-threaded, or otherwise secured, the movablecross head or block K. The centering cylinder B is preferably arrangedabove cylinder A, and the lunger F is provided with a reduced stem T.passing loosely through an aperture in the upper portion of thecross-head or block K, so that the shoulder O on plunger F may abutagainst said cross-head. A suitable stop P is pro.

vided for limiting the outward movement of the plunger F, against whichstop the stem L abuts at the end of its movement.

R represents the casing of the reversing valve of an engine or othermovable art to be actuated, for the invention is not imited to use withreversing valves. The valve stem Q may be suitably connected to one ofthe moving parts of the actuating device, as to the cross-head K asshown, or to the plunger E or G.

Suitable fluid pressure connections are provided for the cylinders A, Band C, wherey the admission and exhaust of fluid pressure to saidcylinders is controlled.

S represents a four-way valve for controlling the cylinders, T is theinlet pipe and U is the exhaust pipe. One side of the valve S isconnected by pipes V and W to the cylinders A and C respectively, thevalveis connected by the pipe X to the centering cylinder B.

In Fig. 4 the details of a suitable construc.

tion of controlling valve are shown. The pipes T, V and W connect withthe annular recesses 61., b and c in the casing, and a sleeve (1 ispreferably inserted and held in the easing in any suitable manner, andprovided with sets of perforations c registering with the recesses a, band c. The plunger f is adapted to be moved longitudinally in the casingand control the ports. The exhaust U is connected by pipe 9 With theexhaust opening it near the top of the casing. The position of theplunger f in Fig. 4 correwhile the other side of .and other uses, thecombination of a sponds to the position of the parts in Fig. 1, in whichpressure in cylinder A has been released because pipe V is in freecommunication with exhaust port h above the plunger and pressure issupplied to cylinder 0 through pipes W and X.

The operation of the device is as follows: With the parts in theposition shown in the drawings, pressure in cylinderAhas been released,while B and C. The pressure on the larger plunger G has overcome thepressure on plunger F, so that plungers E and F have been moved backwardto the limit of their stroke, thus moving the cross-head K to the limitof its movement in one direction, and with it the valve stem I Byrestoring pressure to cylinder A, the combined pressure on plungers Eand F will overcome the pressure on plunger G, thereby moving thecross-head K in the opposite direction until the stem L abuts againstthe stop P, which neutralizes the force on plunger F and the cross headK will be held in its central position by the opposition exerted byplunger G, which is in excess of that exerted by plunger E.

By releasing the pressure on plunger G, the force exerted on plunger Ewill continue to move the cross head K to the opposite end of itsstroke. Upon again restoring pressure behind plunger G, the cross headwill be brought to mid position, and by this means the cross head andthe parts connected thereto are moved as desired.

Obviously some features of this invention may be used without others andthe invention may be embodied in widely varying forms.

Therefore, without limiting the invention to the devices shown anddescribed, Without enumerating equivalents, I claim and desire to obtainby Letters Patent the following:

1. In a reversing device for engine valves and other uses, thecombination of a plurality of cylinders, two of which oppose a third,said third cylinder being larger than either of the others, means forcontrolling the supply and exhaust of fluid pressure to said cylinders,and means actuated by one or more of said cylinders.

2. In a reversing device for engine valves lurality of cylinders andplungers, two of Said cylinders opposing a third, and the area of theplunger of said third cylinder being greater than the area of theplungers of either of the others, means for controlling the supply andexhaust of fluid pressure to said cylinders, and means adapted to beactuated by said plungers.

3; In a reversing device for engine valves and other uses, thecombination of sets of opposed cylinders and their plungers, thecombined plunger area of one set exceeding pressure is applied tocylinders the plunger area of the other set, means for controlling thesupply and exhaust of fluid pressure to said cylinders, and meansadapted to be actuated by one or more of said plungers.

4. In a reversing device for engine valves and other uses, thecombination of a movable part to be actuated, opposed sets of cylindersand plungers connected to actuate said part, means for causing one setor the other of said cylinders to predominate, thereby moving said partin one direction or the other, and means for bringing said part to restat the mid position of its travel.

5. In a reversing device for engine valves and other uses, thecombination of a mov able cross-head, a part connected to be actuated bythe reversing device, a pair of opposed cylinders having differentiallyacting plungers connected to said cross-heads, and a third cylinderhaving its plunger connected to said cross-head and adapted to assistone of saidpair of plungers.

6. In a reversing device for engine valves and other uses, thecombination of a movable cross-head, a part connected to be actuated bythe reversing device, two cylinders having plungers connected to saidcross-head and an opposed cylinder having a plunger of greater area thaneither of the others, connected to said cross-head.

7. In a reversing device for engine valves and other uses, thecombination of a mov able cross-head, a part connected to be actuated bythe reversing device, a pair of cylinders having plungers, one plungerconnected fast to said cross-head and the other plunger sliding in saidcross-head and having a stop to abut against the cross-head, a thirdopposed cylinder having a plunger of greater area than either of theothers and connected fast to said cross-head and a stop to limit theoutward movement of said first named plunger, thereby permitting thecross-head to slide on the plunger in its further movement.

8. In a reversing device for engine valves and other uses, thecombination of two fluid pressure motors of substantially the sameplunger area opposed by a third opposed fluid pressure motor of greaterplunger area than either of the others, a movable member acted on by themoving parts of said motors, and means for controlling the supply andexhaust of fluid pressure to said motors in such manner that saidmovable member is actuated in either direction, or brought to rest at anintermediate position.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

L. H. WHIPPLE, S. W. RICHARDSON.

